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What is the use of active lime in metallurgical production? Uses of active lime for metallurgy

What is the use of active lime in metallurgical production? Uses of active lime for metallurgy

Date of release:2018-02-19 Author: Click:

Lime, as one of the important basic materials of the metallurgical industry, has received more and more attention from the metallurgical industry, especially the accelerated development of steelmaking technology and the reduction of costs, the wide range of demand for variety of steel, and the export of steel produced in accordance with the International Standards Organization. Highly active lime is widely used in fields such as sintering, hot metal pretreatment, steelmaking and refining outside the furnace.




    Active lime is the basic raw material of the iron and steel industry. As a slagging agent for steelmaking, it has the advantages of shortening the smelting time, improving the purity and yield of molten steel, reducing the consumption of lime and fluorite, and increasing the life of the converter lining. Developed countries in the world have all adopted active lime for steelmaking, and Chinese iron and steel enterprises are gradually using active lime, and have achieved better results and benefits. In addition, active lime has also been used in hot metal pre-desulfurization, desulfurization materials, out-of-furnace refining and sintering of iron ore powder.




    Application of active lime in primary refining




    Lime is the main slag-making material for steelmaking. It has the ability of desulfurization and dephosphorization and is used in large amounts. Its quality has an important influence on the blowing process, the quality of steel products and the life of the furnace lining. Therefore, the lime needs to have high calcium oxide content, low silica and sulfur content, low burn rate of lime, high activity, and suitable lumpiness (5-50mm), and it should be kept clean. , Dry and fresh. Active lime has all the above characteristics.


Active lime


   Active lime manufacturers should choose limestone raw materials with less impurities. The impurities associated with limestone, such as SiO2, Al2O3, Fe2O3, MgO, etc., will react with the calcined lime calcium oxide at a lower temperature. The combination of CaO particles and these impurities will reduce the activity of the lime.




   In addition, Na2O impurities can easily form some glass phases. These molten compounds will block the pores of the lime surface and reduce the reaction capacity of the lime. At the same time, it will block the discharge of CO2 gas and cause the lime to burn.




  The equipment for producing active lime mostly adopts the world's advanced level, dual-chamber parallel flow heat storage Maerz lime kiln. This is because the lime produced by the earth kiln has low activity, high burning rate, high production energy consumption and serious pollution.




    When we feed the active lime price kiln, if the feed volume is large, the temperature at the end of the kiln will be correspondingly lower, and the rate of heating of the material will be correspondingly slowed down. At the same time, if the feed rate is too large, the moving speed of the active lime in the kiln will also become faster. The above two factors will cause the length of the active lime kiln preheating zone to increase and make the position of the calcining zone move forward or shorten.


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